The "Keeping Up with the Kardashians" star, 38, made the announcement via Twitter and Instagram Friday afternoon.

She also posted a sweet photo of the sleeping infant alongside a screenshot of a message from her husband that read, "Beautiful Mother's Day. With the arrival of our fourth child. We are blessed beyond measure. We have everything we need."

Fans previously speculated that the couple was planning to name their son Bear, due to her recent use of a certain emoji — and TODAY editors even brainstormed some ideas of our own. But Psalm, which means "a sacred song or poem used in worship," is one we hadn't guessed!